|Grundy County Illinois Cities/Towns - Aux Sable, Braceville, Carbon Hill, Coal City, Diamond, Dwight, East Brooklyn, Gardner, Godley, Kinsman, Mazon, Minooka, Morris (County Seat), Nettle Creek, Saratoga, Seneca, South Wilmington, Verona, Wauponsee
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Grundy County is a county located in the U.S. state of Illinois. As of 2016, the population was 50,437. Its county seat is Morris.
Grundy County was established on February 17, 1841. It was named for Felix Grundy, political leader. He was appointed (1838) Attorney General by President Van Buren and resigned (1839) to return to the Senate.